Suefacihg machine



Nov. 15, 1927.

G. A. OLIN SURFACING MACHINE Filed April 25, 1924 7 Sheets-Sheet 21522757; d aabaf ,Zi 02m? Nov. 15, 1927.

G. A. OLIN SURFACING MACHINE Filed April 25. 1924 7,Sheets-Sheet 4,frzwrzir: Gastaf ii. 223

orngy 7 Sheets-Sheet 5 I\ Nov. 15, 1927.

G. A. OLIN SURFAGING MACHINE Filed April 25, 1924 fzmyzz'r: G astczf E.03372 .Ill'l I '7 Sheets-Speet 6 G. A. GUN

SURFACING MACHINE Filed April 25, 1924 QNN fir/72252: c asta 10251? warne5 Nov. 15, 1927.

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Patented Nov. 15, 1927.

GUSTAF A. OLIN, O3? 'WORCE8TER, llEASSACI-IUSETTS.

SURFACING MACHINE,

Application filed April 25, 1924.

This invention relates to improvements in surfacing machines and, hasparticular rcitcrence to a novel and improved construction of machinesespecially adapted for use in surfacing various forms of disks, such asgrinding and abrasive wheels, clutch plates and similar articles.

One of the objects of tee tion is the provision o a uchine which shallbe capable of sate: i only handling large and heavy disks and which maybe cmployed to operate upon ei her one or both surfaces of the disk at atime as may be preferred.

A further object of the invention is the provision of a machine of thecharacter specified which when employed in surfacing both sides or" adisk will insure the two tacos of the disk being sufiiciently parallelfor all commercial purposes, and which will reduce to a minimum the timeneccssry to properly position a disk within Sui; cing machine and whichwill eliminate all the ditliculties hitherto experienced withuni-lateral machines in which it has been necessary to shift andcarefully set up the disk for the proper surfacing oi the second sidewith re spect to the first.

Another object of the invention is the provision of a machine capable oisatisfactorily handling and automatically positioning various forms andtypes of disks and which may be employed with equal satisfaction withdisks having central arbors or with disks having merely an aperturecentrally thereof to subsequently receive a shaft or arbor, and which ineither event will insure formation of the surfaces of the disk in properrelationship to said central aperture or arbor.

Another object of the present invention is the provision of a machine oithe character set forth which shall be particularly adapted for handlingand treating largo abrasive wheels and which shall be so constructed asto resist to a maximum degree wear of the several parts thereof due toaction oi the abrasive particles removed during the surfacing operation,and in which the various vital parts effecting satisfactory and accurateoperation of the device shall be protectcd against access of abrasivethereto, and in which parts liable to become stuck or present inven-Serial No. 708,921.

frozen shall be both protected and at the same time rendered readilyaccessible for release thercoi upon failure of same to properly operate.

Additional objects of the invention include the production of novel andimproved means :lor automatically and for manually controlling theoperation of the several parts of the machine and of improved mechanicalfeatures simplifying and improving the operation of the individual unitstogether c0nstituting the machine as an entire operable combination.

Certain embodiments of the invention are illustrated in the accompanyingdrawings, but it is to be understood that I may make any modificationsin the specific details oi construction shown and described within thescope of the appended claims without departing from or exceeding thespirit of the invention. 1

Figure l is a front elevation of one embodinicnt oil the invention.

F igure 2 is an end view with parts shown in section.

Figure 8 is an enlarged detailed view of the arbor positioning device.

Figure 3 is a view on a corresponding scale of the centering pointrelease lever and associated parts.

Figure is a view of the rear of the machine with the gearing case shownin section and the drive motor for the chuck at the side of the machine.

Figure 5 is a slightly modified sectional view as on the line 5-5 ofFigure at.

Figure 6 is an enlarged sectional view oi one of the special bearingsfor the disc-carrier.

Figure 7 is a detail of the take-up for lateral play when the partsbegin to wear.

Figure 8 is a section on the line S8 of Figure 1.

Figure 9 is an enlarged view o l the cutterslide adjusting mechanism.

Figure 10 is a section on the line lU1O of Figure 1.

Figure 11 is a fragmentary section on the line 11-11 of Figure 10.

Figure 12 is a central sectional view of the disk-holding member orclutch.

Figure 13 is a detailed sectional view of the releasable gibs for thecutter feed-slide.

Figure 1a is a fragmentary view illustrating the oil reservoir forlubrication of the slides of the main table.

Figure is a view in elevation of the centering arbor usable with mymachine.

Figure 16 is a sectional view thereof.

Figure 17 is a fragmentary sectional view illustrating the lateralguides for the main table.

Figure 18 is a fragmentary elevation illustrating said guides.

Figure 19 is a fragmentary section as on the line 1919 of Figure 12.

Broadly speaking, the present invention comprises a heavy bed or supportand a table slidablc on the support, the parts being of sufficientweight or inertia to permit of handling of heavy work without vibrationor chatter of the parts. The table is centrally slotted to provideclearance for an annular frame carried by the bed. This frame hasrotatably supported therein by suitable dustproof antifriction devices aclutch member for engaging and supporting the disk to be operated upon.The annular frame is provided with. means for positioning the diskwithin the clutch to both center it axially of said frame and with itsaxis coinciding with the axis of rotation of the clutch so that at thecompletion of the surfacing op eration both sides of the disk will beparallel and normal to the arbor or arbor-aperture of the disk.

Suitable means is provided for automatically reciprocating the tablewith respect to the rotatable clutch of the bed, and for automaticallycontrolling said reciprocations. In addition, means are provided wherebysaid automatic reciprocations may be 1nanually varied both as to speedof movement and extent of stroke.

The table is provided at each side of the slot with a slide for asurfacing tool, and the control mechanism for said slides isparticularly protected to prevent access of dust or abrasive particlesliable to cut the adjusting screw-threads or to clog them up andinterfere with proper operation thereof. Special. releasable gibs arealso provided for the slides to prevent trouble from sticking thereof.

In the drawings, the numeral designates the bed of the machine, whichhas the guideways 26 for the longitudinally extending guide-ribs 27 onthe table 28. The table is centrally slotted as at 29 to span the frame30 which fits and is secured in the hollow or able tightening andloosening of the respective nuts and bolts in the customary manner ofsuch ad ustments.

masses The table is provided at each side of the slot 29 with atransverse guide portion 33 for the slide 3% bearing the tool-holder 35for tool 36 which may be of the type shown and claimed in my co pendingap ilication Serial Number 70 ,920, filed April 25, 1921:.

An adjusting screw 37, with sp' cial screw protecting devices ashereinafter described, and a hand-wheel 38 serve to adjust the tooltoward and from the disk to be surfaced hereby.

As shown in Figure 1, a motor 39 is mounted adjacent the bed and isconnectcd through suitable jointing with a shaft which extendslongitudinally of the bed. This shaft is jouri'ialed in suitable ball orantifriction-bearings l1 and has a pinion 12- which drives the pinion 13carried by herring-bone gear letto rotate said gear. As an alternative,this gear i l may be directly driven, as shown in Figure 5.

in either event, gear 1% meshes with the toothed periphery 241% of thetwo halves 15 and '16 of the rotatably mounted annulus or ring whichcarried the disk-supporting and retaining clutch member shown in Figure12 and later described in detail.

The shaft a0 is further provided with a worm 17 which drives shaft L8,and through suitable speed reduction gearing t9 the countenshaft havingsplined thereon the sliding speedwarying sleeve 51 bearing the severalpinions 52 for cooperation with the gears 53 on shaft 5% to drive thelatter at varying rates of speed. Loosely mounted upon the shaft are thepair of beveled pinions 55, 56, in mesh with the beveled gear 57 onshaft 58. A clutch member 59 slidably splined on shaft 5% serves as areverser to connect one or the other of pinious 55, 50 with shaft 5 1 sothat gear 57 and its shaft 58 may be driven in either clockwise orcounter-clockwise direction desired. This shaft has the pinions 6Omeshing with the racks ('31 on the under side of the table 28, wherebyrotation of the shaft 58 serves to move the table back and forth orreciprocate it on the bed. This reciprocation, it will be understood isat a quite slow rate of speed. but serves to gradually move the tools 36over the faces of the disk 62 being operated upon.

Rotation of the shaft 58 may be effected either manually by use ofhandle (33 or automatically. The automatic control includes the shiftlever G l-l having a portion engaging the clutch member 59 and anurnvardly extending portion engaging the slide block 65 on guide-rod 6Gand terminating in a socket for the resiliently actuated plunger 67.This plunger is adapted to alternately seat in socket ($8 or GS) of theframe-plate to lock the lever in shifted position. It may be releasedfrom said socket by depression of control-plunger 71 which projectsupwardly iuu from the franieplate as most clearly shown in Figure 8.

Mounted on the end of the table 28 is a bracket 72 while spaced from itis a second bracket- 73. These serve as supports for the rod 66, whilemounted on each end of the rod between the block and the'bracket is aspring T l. its the table reciprocates, one or the other of thesesprings is compressed against the block and exerts its force against thelever 6%. With a spring under compression, depression of the properplunger 71 "ill release the lever and allow it to snap over under theimpulse of the spring, thus shifting the clutch member and by engagementwith the opposite beveled pinion reversing the direction of movement ofthe table.

This releasing action is effected by the cam members 75 on arms 76. Theouter arm is preferably rigidly held in position and serves to reversethe table by riding over and depressing the left-hand plunger shown inFigure l as the table reaches its limit of movement or the center of theannulus, while the supporting bracket 77 for this arm has an adjustingscrew 78 for moving the other arm toward and from the first to vary thelength of stroke of the table. Bolts 80 serve to lock the adjustablearm, or if desired, both arms in desired position. This rotation of theadjusting screw may be satisfactorily accomplished asby application of awrench to the squared end 79 of the screw 78.

The machine as illustrated is capable of operation at three differentspeeds at the will of the operator. To facilitate control of the speedsand at the same time to simplify the structure as far as possible, Ihave provided an improved progressive gear shift control including theshift lever 81, rock shaft 82 and segment 83. The segment 83 meshes withthe teeth of rack 8d which is slidable on the guides 85 of the main gearcase cover 86. The rack has a shift yoke ST for engagement with thespool portion or groove 88 of sleeve 51, so that as the rack is slidback and forth by rocking of lever 81 and segment 83 a correspondingsliding movement will be imparted to the sleeve to progressively shiftthe several gears 59 into and out of engagement with respective portionsof the compound gear 53 and thus to vary the relative rates of speed ofthe two shafts 50 and To facilitate assembly of these several parts inproper relation, the cover 86 is formed with an opening aligned. withthe rock shaft 82 and of such size that the segment 83 may be applied tothe shaft through said opening. In assembling, the several parts,including the shafts, gears and rack bar are first pla ed in positionand the cover secured. The segment is then applied to the rock shaftwith the lever in proper relation to its control segment 91 as respectsthe adjustinent of the rack bar and gears and the segment 83 secured.This insures proper adjustment of the shifting mechanism and gears sothat the movement of the lever 81 to definite positions will causeproper meshing of the desired driving gears for the feed.

It will be noted that the table at all times overlies the bed andprotects the supportin surface thereof, while the upper surface or thebed is formed with the V-shaped guideways 26 having the grooves 93 atthe bottom of the V and 94 at the upper edges thereof. The guidewaysreceive the V-shaped ribs 27 on the under side of the table, while thegrooves are closed by said ribs and form oil-receiving passages. Oilreservoirs 96 are secured on the bed at the ends of the guideways and inwiping contact with the end portions of the ribs as they are projectedbeyond the ends of the bed during the reciprocating movement of thetable. These reservoirs serve to back up the film of oil carried alongby the ribs, any excess being forced upward from the reservoir into thegri'ioves )-l where it will work down to keep the entire bearing surfaceproperly lubricated. In addition, the bottom of the groove 93 and of thereservoirs 96 serve as t 'aps for any dirt or abradant particles whichmay get onto the sliding surfaces or into the oil and thus reduceliability of wear of the slide surfaces or sticking thereof.

As the work to be done by the present machine frequently involvesconsiderable friction, and to overcome any lifting tendency on the partof the table when toward the end of the stroke, I may secure on one orboth sides of the bed guides 97, as illustrated in detail in Figures 17and 18. Bracket members 98 are secured to the under side of the tableand have recessed inwardly extending portions 99 underlying the guides.Antifriction rollers 100 are mounted in the recesses of the portions andproject slightly thereabove to engage the under face of the guide railsand hold the table down onto the bed and against any tilting or liftingwhen in use.

I have previously referred to the factthat the table has guides 83 forthe slides 34: supporting the work engaging tools at both sides of theslot 29. The slide 34-, as best shown in Figures 5 and 9, has thedepending portion 101 formed with an annular flange 1012 providing arecess to receive the collar 103 on adjusting screw 37. To coope atewith this screw, the table has a portion 104 having a passage or bore at105. A tubular member or sleeve 106 has an enlarged portion 107 fittinga portion of the bore and a portion of less diameter extending withinthe remainder of the bore in spaced relation thereto. This sleeve issecured in position as by the pin or pins 108. The free end of the lIl-Utube has suitably secured therein as by threading the interiorlythreaded nut member 109 for cooperation with the adjusting screw 37.

To prevent access of dirt or abrasive material to the threads of thescrew and nut, there is mounted on the screw 3'? between the shoulder110 thereof and the portion 101 of the slide, the bushing 111 to whichis secured the thin brass 1" similar material protecting tube 112 whichprojects along the screw in spaced relation thereto and between thesleeve 106 and the wall of the aperture 105. A collar 113 pinned to thescrew 37 rotatably secures the tube and its bushing for sliding movementtherewith. A screwplug 114; forms a closure for the inner end of thesleeve. It .will thus be seen, that the sleeve is sealed at one end bythe plug, while the other end is at all times closed and both the nutand screw protected by the tube 112 which at all times telescopes withthe sleeve interiorly and with the bore of the portion 104: exteriorlyto provide an eXt-reniiely clustproof structure.

To prevent any sticking of the slide in its guideway, the ordinaryonepiece dovetailed guide portion is replaced by a sectional one asshown in Figure 18. As there indicated, the slide 34.- has an integralguide portion 1.15 and a separate guide-.gib 110 secured in position byscrews 117 carried by the slide and extending through the elongatedslots or apertures 118 in the gib. These screws thus hold. the gibtightly against the under side of the slide but permit of relative inand out or lateral movement of the parts. To con-- trol the position ofthe gib 116, 1 make use of the wedge or key m'unber 119 interposedbetween the guide members and 110 and having inclined or wedgingsurfaces engaging one or both of said parts. Secured to said key andprojecting outwardly therefrom is a stud 120 having an outer threadedend 121 projecting through an aperture in the depending bracket 122 ofthe slide. A nut 123 is located between the bracket and the face of theslide 34:, while a second nut 12 i is engaged on the outer end of thestud. 'llightening of these nuts serves to draw the key into properrelation to expand the parts 115 and 116 into desired relation, when thenuts may be tightened against the opposite faces of the bracket to lockit in position. In the event that the slide sticks or binds, it may beloosened by releasing nut 12% and further tightening nut 123 against theinner face of the bracket, forcing the key inward to release the gib116. This action may be supplemented if necessary by tapping against theouter end of the stud.

T716 war s-supportiag mechanism.

As previously mentioned, the work supportlng mechanism is located in atrough or central depression in the bed and projects upwardly above thetable through the slot 29 therein. It somprises an outer rigid frame, aninner or intermediate rotatable portion, dust-proof anti-frictionbearings for rotatable portion, a work holding member or chuck carriedby said portion, and means for properly positioning the work within theholding member.

As clearly illustrated in Figure 5 of the drawings, the outer framecomprises a pair of annular or ringlike members individually designatedas 125 and 126 respectively. These members have the outer flange 12T12b,joined by the bolts 12$). lhe two frame members together thus provide acentrally open or grooved annulus into which tits and in which revolvesthe intermediate rotatable portion consisting of a ring formed by heunion of the two members and a0. As shown in Figure 5, there is securedto each of the members 15 and 4:0 a race 130, while secured to theinterior of the members and 126 are the races 151. interposed betweenthe two sets of ball races are the ball bearings 132 which thus supportthe intermediate member for free rotation about its axis as well astaking up any lateral pressure thcreagainst.

inwardly of the bearings the frame and the rotatable portion havesuitable dust-ciceluding devices of either to t or other pacle ing, orpreferably of interlocking babbitt or other bearing metal as indicatedat 133 in Figure 5 and shown enlarged at 133 of Figures 6 and 7. Asshown in these Figures, there are two annular rows of this packing whichserve to render the bearings proper dust-proof.

Figure 6 illustrated a form of adjustable bearing for the intern'iediatemember which is capable of employment either in place of or in additionto the annular ball-bearings. it comprises a plurality of rollersdisposed around the periphery of the rotatable gear member 15 46substantially as shown in Figure 1, the member 30 having secured theretothe brackets 13 1- to support said bearings. Journaled in these brackets184 are the trunnions 135 of the cap plugs 13 One of these plugs screwsdirectly into one end of the bushing 137 while the other plug similarlyengages the intermediate removable bushing 138 which is in turn engagedin the main bushing. Immediately interim-1y of the cap plugs in the mainand supplemental bushings are the bearing-cages 1&3 for the ends of thetrunnions or axles 139 of the rollers 1410 which ride on the herringboneteeth of the member l5al;6. lluts 141 retain the cages on the ends ofthe axles, while the caps serve to retain the bearings as an entirety inposition.

To further aid in exact positioning and retaining of the rollersindependent of the llli bearings as respects lateral movement, the mainand supplemental bushings are formed with the cooperating inwardlyprojecting or opposed flanges 1: 2 engaging the opposite ends oi theroller. It will be noted thatthe engagement of the flanges is controlledby inward screwing of the supplemental bushing 13S, and that by removingthe brackets and end plugs the balhheari gs may be removed, while it isn cessary to also remove the supplemental b hin g ne'lore the rolleritself can be removed from proper position in the bushing.

Attention is invited to the fact that the main bushing is eccentricallybored tor the cap and supplemental bushing. so that the roller is heldin eccentric relation thereto. This is to provide for adjustmentoi thebearing 01 the roller on the teeth 211 at the carrier gear, in thatturning 01 the device as an entirety as by application of a wrench tothe projecting ends of the trunnions 1235 will shift the axis ofrotation oi? the roller 140 inward or outward as desired. T o lock theparts in desired position the hubs 1 1-3 on the brackets for thetrunnions are provided with set screws 14% which lock the trunnionsagainst accidental movement.

To most thoroughly enclose the parts against access of dust and abrasiveparticles. I preferably enclose the caps, bushing and contained parts bythe sleeve le which fits within the brackets and their flanges 1 16,said sleeve being interiorly cutaway in the portion enclosed by the mainframe to permit the roll 1-10 to project into supporting engagement withthe *im of the rotatable member LIP-46.

When the annular ball-bearings and the rollers are both employed tosupport and position the rotating member, the only function of thehabbitt or likc material is to exciudc dirt. Even in that. 'nstance, itis desirable to have some in Pans of relatively adjusting the packing orscaling substance and the rotating member to facilitate properassembling and litting of the parts. Should it he desired to eliminatethe ball-bearings, this adjustment then becomes of primary importance. Apreferred term of attaining this result is shown in l igure T. Thepacking or hearing material 133 is carried on one or both sides in aring or segment of a ring 117 litting in a groove in the inner face ofone of the members l25126. Said member is tapped to engage theadjustingplug 148 which has a reduced end 1 1-9 projecting into thegroove and lilting a counersink or recess in the outer face of the ring1 17. This end holds the ring member against rotativc or slidingmovement and at the same time tightening of the member 1% serves toforce the ring toward the intermediate rotating member to insure aproper lit between the parts and take up any possible loosencss or sideplay. The plug is centrally drilled and countersunk for the lock-screw150 which is tapped into the member 1-17 beyond the end 1 19 of theplug. 'lightening oi? this screw serves to lock the parts in inwardlyadjusted position.

The work-chuck.

It will be noted by reference to Figure 5 that the member #15 has aflange extending inwardly ot' the member 16 while secured to this flangeas by the bolts 151 is the outer ring or shell of the work-holdingchuck. This shell has titted thereinto the cam ring 153 having seats forthe jaw actuating cams 15-1- and has a rack portion A gear 156 isjournaled in the shell in mesh with the rack to impart an oscillatorymovement to the ring, while a pinion 157 meshes with the gear and has asquared hub 158 for engagement by a suitable wrench or key to rotate thelatter and thus shift the cam ring. A plate 159 forms the closure forthe other side of the shell, which is formed with inwardly directedapertures 160 enclosed by guide flanges 161. These flanges serve asguides for the chuck jaws 162. Said jaws are centrally keried to receivethe rollers 163 which ride on the cams 154 and force the ja inward intoclamping engagement with the work. To prevent disengagement of the jawsand to retract them when the cam pressure is released, I drill in theshell at the side of the jaws the sockets 16 1 into which projectlaterally the pins 165 carried by the jaws. Resting on the pins 165 arethe washers 166 affording a. proper bearing for one end of the springs167 whose other ends engage the plugs 168 which form the closures forthe apertures. Outward actuation of the aws through the pins and washers compresses the springs, while the expansion oi the springs onrelease 01 the cams serves to withdraw the jaws from engagement with thework being surfaced. Also, the springs, when completely compressed bytheir cnggement with the pins limit the possible outward movementof thejaws unless the retaining plugs 168 are removed.

l'Vorie positioning mechanism.

As the present machine is adapted to operate upon both sides of a disksimultaneously, and to produce pa 'allel surfaces on the disk, it isparticularly desirable that the disk shall initially be properly linedup in the machine. That is to say, for most rapid production, and toobtain the best resultant product, the central plane of the disk atright angles to the axis thereof should be placed in the machine tocorrespond with the similar plane of the rotating carrier and allpossibility of twisting of the disk eliminated.

In the accomplishment of this result a plurality of mechanisms areemployed, each capable of independent use in some instances, but inothers co-operating and coacting together in the positioning of thedisk. These include means for centrally engaging a bushed disk and meansfor laterally engaging one face 01" the disk, the latter cooperatingwith the center engag means in the case of unbushed disks.

Figures 15 and 16 may be considered as a starting point forconsideration of the positioning means, in that they illustrate theconstruction of an ii'nproved centering arbor. This member COI'DQl'lSQSthe arbor proper 165) having the sockets 170 in the ends on its axis forpositioning thereo't. 'lhe arbor is fur-- ther formed with the series ofcircumferentially extending" grooves or markings 11 1 progressivelyspaced predetern'iined dis tances trom the center-nuuk 172.Longitudinally extending ii'iai.'l'-:ings 1'13 transverse the circumtecntial markings and at the intersections of the two are to med in anadvancing spiral the recesses or countersink; 17 1-. These recesses 174:are oi? depth to properly receive the lower pointed end of the set screw175 carried by the sleeve or collar 176. This collar is slidably mountedon the arbor and adapted to be secured in desired adjusted positionthereon by engagement of the set screw in one oi? the sockets 17-1. itis provided with an mitwardly extending pe ripheral flange 1?? adaptedto engage the central portion oi? the face ot a disk to be surfaced. ltwill. ot course be understood that the mechanism here described is employed only when the disk in question has a central hole or a 'ierturowhich will receive the arbor, and that in practice a number of diilerentarbors are employed to litthe dil terent sizes of apertures which thedisks may have.

lllach ot the longitiuilinally et tcnding marhngs 173 s provided with ane onent,

such as the do? nation if; as shown i i igure 16. This ezizponentdenotes the thickness oi? disk which will be properly centered on thearbor when the screw is engaged in the socket 174 intersected by thatparticular line. As previously mentioned, the arbor has the center line172 which is intended to coincide with the center oi thickness of thedisk. The several lines 171 are then spaced desired distances, as forerzan'i 'ile, every -fi oi an inch, so that shitting the screw "from onesocket to the next will entail a movement of the collar longitiulinallyof the shaft onesixtcenth or an inch. This will serve to properly centera stone one-eighth of an inch thicker than the previous setting. Ineither event it will be understood that the stone or disk is broughtinto tight engagement with the flange 177 as shown in Figures 15 and 16.Cl he distance from the screw to the end of the collar is preferably socalculated that when. the screw is in engagement with the socket at aconcealed annular line, the edge of the collar will just coincide withone of t 1e other parallel graduations. Each of the circumferentialmarkings thus serves both as a locus for a socket and as a guide inlining up the collar with the set screw thereof in position to be easilyengaged in the de sired socket.

The correct circum'lerential positioning of the screw is determined bythe line 173 which bears at its outer end the measurement 01 stone whichwill be centered it the screw is engaged in the socket intersected bythat line, this measurement being double that of the actual distancefrom the center designation on the arbor to the taco ot the flange 1'77.

To support the arbor and workpi ce in the machine prior to theengagement of the chuck jaws with the work, i make use of thesiu'iporting and positioning devices particularly illustrated in Figures2 and 3. Suitably bolted to the frame 30 are the brackets 1T8 supportingthe bearing 179 for the rocksha't't- 180. This shaft has secured on itsends the positioning arms 18.2 which depend in yoke-like relation at thesides of the frame 30 and have their lower portions when in verticalposition as shown in Figure 1 in alignment with the axis 01 the frame.The arm 182 bears a. stationary center point 183 for engagement in oneot the sockets 170 of arbor 179, while the other arm 181 has means forresiliently engaging the arbor but which may be disengaged to releasethe arbor as desired.

Said releasable mechanism includes a tubular end 18-1 having slidablymounted therein the bushing 185 formed with trunnions 186 projectingoutwardly through the slots 18? in the portion 184-. A. center point 189similar to the point .183 has a tapered shank fitting within thebushing. while the rear of the bushing is reduced to form a. shoulder189 and receive the actuating spring 190. The other end o't this springbears against the plug 191. it screw or pin 192 is slid able through theplug and has its ends secured to the bushing to "term a guide thereforand limit its movement as influenced by the spring, as is clearlyillustrated in Figure 3.

To retract the center point .188 for inser t-ion or removal of a worksupporting arbor, l mal ce use oi? the lever 193 wh'ch is pivotallyengaged on one of the trunnions 186 and has an cccentrically curvingslotted head 19s. A pin 195 projecting laterally 'tron'i the portion 18%is engaged in the slot of the head of the lever, so that as the lever isrocked on its pivot trunnion the action of the pin and eccentric slotwill draw the trunnion and thus the bushing 185 and point 188 toward theleft or into retracted position, so that there is sufficient space fordisengagement or reception of an arbor 169. The position of the arborwhen held by the points is shown in Figure 2.

In some instances the fit between the disk or stone forming thework-piece and the arbor is suiiiciently satisfactory so that no otherpositioning means are required. In that event, the arbor being properlysupport-ed by the arms 181 and 182, the chuck jaws are forced inward tosecure the work in place, it being understood that the disk is firmlypressed against the flange 177 of collar 176 during the clan'ipingoperation. By retraction of point 188 the arbor is then released and maybe slightly shifted to disengage it from the other centering point 183,when the arms may be swung to the position indicated in the dotted linesof Figure 1 and secured in that position by tightening of the clampscrews 196. The arbor can then be withdrawn and the surfacing operationcommenced.

In those cases where the arbor does not suti'iciently accuratelyposition the disk, or if it is not possible or desirable to employ thearoor, as when the disk has either no aperture or an irregular one, Imay make use of the positioning member shown in Figure 4. This membercomprises a skeleton or frame having an outer ring 197 of size to justfit within the frame and hinged thereto as at 198. Extending inwardlyfrom this ring are the radially arranged spoke members 199 which stop adistance from the center and are connected by the segment 200 having anopening at the side toward the tool so that the surfacing operation maybe performed without removal of the device.

The arms or spokes 199 are provided with the adjustable contacts 201which project inwardly from the spokes to 'contact with the face of thedisk being mounted and by their engagement therewith at a plurality ofpoints insure proper alignment thereof with respect to the machine.

The ring 19? also carries the latch 202 for engagement with the keeper203 on the frame 30. This keeper has suitable notches or the like forselective engagement with the latch so that the ring may be locked intight engagement with the frame for positioning of the disk to besurfaced, or may be engaged with an outer portion of the keeper. Forthis engagement the ring is swung outward about its hinge a suflicientamount so that none of the contacts bear against the disk, when thesurfacing may be performed without; entire remo *al thereof, thesurfacing tool, as aforesaid passing into and out of the frame throughthe gap in the inner segment 200.

It will be understood that to take care of diti'erent thicknesses ofdisks, the contacts 201 may have either an in and out screw adjustment,may be removably fitted in place and interchangeable according to thedistance from the positioning frame that the surface to be operated uponis to be located, or the frame as an entirety may be removed and adifferent; one substituted.

In any event, the disk is pressed from the front of the machine againstsaid contacts and the chuck jaws tightened to retain it in place, theuse of three chuck jaws making them substanially self-centering asrespects the work held thereby, altho other positioning may be attainedeither by the employment of adjustable jaws or the use o t interposedshims should it for any reason be desired to eccentric-ally locate thework in the chuck.

From the foregoing description taken in connection with the accompanyingdrawings the construction and operation of the several parts of myimproved surfacing machine for disks, abrasive wheels or the like shouldbe readily understood. It will be seen that I have provided an extremelydurable and satisfactory machine in which all the moving and workingparts are pro tected from dust and abradent particles which would tendto wear the contacting surfaces or clog them and cause sticking of theparts in use.

It will further be noted that by the use of my machine the work may bereadily positioned with extreme accuracy and by positioning means whichform a part of the machine in constant predetermined relation theretoand which may be easily shifted into operative position to engage thework or moved out of the way to avoid interfering with the surfacingoperation.

Especial attention is invited to the fact that by the use of myimprovement at very heavy workpiece such as a large abrasive wheel maybe securely held and satisfac torily supported for free rotation upon durable, adjustable autifri(-lion bearings.

Also that said bearings are fully encased and protected from the actionof the abrasive particles removed during said surfacing operation.

In addition, through the employment of my improvements it is possible toemploy a positive gear drive for the rotatable work holder, and toprotect the gear teeth against clogging or rapid wear and tosatisfactorily steady the rotatable work supnort to prevent chatteringof the gearing thus employed or jumping of the work under the heavyservice conditions and requirements of the surfacing operation.

Also, through the employment of my improved mechanism these advantagescan be attained and at the same time the two sides ously to produceparallel finished surfaces in minimum time and through the use of asingle feed mechanism for the tool members, said feed mechanism beingadapted for automatic control, reversal, etc., through the use ofsimplified and improved adjustable controlling devices.

I claim:

1. A surfacing machine of the character described, including a bed, anannular frame mounted on and rising from the bed, a workholder rotatablysupported by the frame, said worlrholder having a geared portionenclosed by the frame, and. driving means in chiding a pinion n'icshingwith the geared portion and enclosed by the fran'ie, whereby said meansserve to rotate the workholder and the frame protects the gear andpinion portions fron'i work-particles removed. during the surfacingoperation.

A machine for use in surfacing abrasive wheels, including a bed and anannular frame mounted thereon and rising therefrom, an. annularworkholder having a geared on edge mounted in the frame, antifrictionmeans interi'i'iediate the fran'ie and workholder to facilitate freerotation of the latter, driving means jomrnalcd in the frame andincluding a pinion meshing with the gear of the holder, and interlockingmeans on the frame and holder to exclude access of abrasive particlesfrom the work to the gearing and the antifriction means.

3. In a surfacing machine, the combination with a supporting frame, ofan annular workholder having a peripheral herringbone gear formedthereon, and supporting bearings for the workholder in the form ofrollers carried by the frame and riding on the surface of said. gear. l.in asurfacing machine, the combina tion with a supporting frame, of anannular workholder having a peripheral gear formed thereon, supportingbearings for the Workholder in. the form of rollers carried by the frameand riding on the teeth of said gear, and means for adjusting theposition of said rollers with respect to the frame whereby theirpressure against the workholder is varied.

In a surfacing machine. the combina tion with an annular supportingframe, of a workholder rotatably supported thereby, said holder having aperipheral driving gear, antifriction bearings holding the holder withinthe frame with the gear in spaced relation thereto, said frame having anoffset POI'illOU, a drive pinion in the offset meshing with the gear,and means operating the pinion to rotate the gear.

6. In a surfacing machine, the combination with a supporting framehaving an innor annular guideway and an offset pinionreceiving recess,of a workholder rotatably mounted within the guideway, ball-bearingsupports carried by the frame and having portions engaging the holder,and adjustable packing members carried by the frame and laterallyengaging the workholder, substantially as and for the purpose set forth.

7. In a surfacing machine of the character described, the combinationwith a support, of a frame carried thereby having an annular trackway, aworkholder rotatably mounted in the trackway having means forperipherally engaging a workpiece, and means on the frame shiftable intoposition to laterally engage and position a workpiece when in theworkhold-er.

8. In a surfacing machine of the character described, the con'ibinationwith a. support, of a frame carried thereby, a workholder rotatablymounted within the frame, said workholder including radially slidablejaws for engaging the periphery of the work, and means pivoted to theframe and projectable into and out of position to laterally position thework prior to the engagement of the jaws therewith.

9. In a surfacing machine of the character described, the combinationwith a support, of a frame carried thereby, a workholder rotatablymounted within the frame, said workholder including radially slidablejaws for engaging the periphery of the work, a ring slidably mountedwithin the workholder having individual cam portions for the severaljaws, and means for shifting the ring with respect to the jaws to forcethe latter inwardly.

10. In a surfacing machine of the character described, the combintionwith a support, of a frame carried thereby, a workholder rotatablymounted within the frame, said workholder including radially slidablejaws for engaging the periphery of the work, a ring slidably mountedwithin the workholder having individual cam portions for the severaljaws, means for shifting the ring with respect to the jaws to force thelatter inwardly, the holder having sockets formed therein adjacent; thejaws, and means in the sockets operatively connected with the jaws forretracting the jaws when the cams are shifted into releasing position.

11. In a surfacing machine of the character described, the combinationwith a support, of a frame carried thereby, a workholde-r rotatablyn'iounted within the frame, said workholder including radially slidablejaws for engaging the periphery of the work, a ring slidably mountedwithin the workholder having individual cam portions for the severaljaws, means for shifting the ring with respect to the jaws to force thelatter inwardly and to release them, the holder having sockets 'formedtherein adjacent the jaws, the walls of said sockets having slots at thejaw sides thereof, pins on the jaws projecting through the slots intothe sockets, and springs, in the sockets having ice one end engaging theworkholder and the other the pin for retracting the pin and thus the jawwhen the cam ring is shifted into releasing position.

12. In a surfacing machine, the combination with a bed, of a workholderand a toolholder supported thereby, and means for advancing thetoolholder in the direction of the workholder including a slidal'ilesupport for the toolholder, a guide for the support having an interiorlythreaded sleeve, an adjusting screw on the support interiorly eugagingthe sleeve, and a prolecting tube can ried by the support and enclosingthe screw in spaced relation thereto, the sleeve having sliding fit withthe interior of the tube, whereby the tube prevents abrasive particlesfrom the workpiece being surfaced entering the threads of the adjustingscrew and the sleeve.

13. In an abrasive wheel surfacing ma chine or the like, the combinationwith a table having a guide, of a tool slide movable over the guide, asleeve member secured to the table and projecting adjacent the guide.said sleeve having an interiorlv threaded portion, an adjusting screw onthe slide engageable with the threaded orl'ion of the sleeve, and a tubecarried by the slide and having a sliding fitwith the sleeve, said tubebeing rotatably mounted on the screw, substantially as and for thepurpose described.

14. In a machine of the character described, the combination with aworkholder, of means for positioning the work within the holder, saidmeans including an arbor positioning device and an arbor, an abutmentmember adjustable on the arbor, and means for securing the abutmentmember in proper position on the arbor to center a given thickness ofworkpiece.

15. A work positioning device of the character described, comprising anarbor having a work-piece center designation and having longitudinallyspaced therefrom a series of transverse markings and intersectinglongitudinal markings,there being sockets formed at the intersections ofthe markings in an advancing convolute curve, and a workpiece abutmentmember slidable on the arbor, said member having a locking device forselective engagement in the sockets.

16. A work positioning device of the character described, comprising anarbor having a work-piece center designation and having longitudinallyspaced therefrom a. series of transverse markings and intersectinglongitudinal markings, there being sockets formed at the intersectionsof the markings in an advancing convolute curve, a work- 'Jl'GCGabutment member slidablc on the aror, and guide and locking members onthe abutment so spaced that they will simultaneously aline with spacedtransverse markings on the arbor, whereby the guide portion of theabutment facilitates lining up of the locking member with a desiredsocket.

17. In a machine of the character described. the combination with asupporting bed, of a workholder carried thereby, and positioning meansfor the work comprising a frame hinged to the workholder and adapted tobe swung into position to laterally engage the work, said frame beingopen at one side to facilitate access of a tool to the workpiece withoutremoval of the frame.

18. In a machine of the character described, the combination with asupporting bed, of a workholder, a supporting frame therefor mounted onthe bed, said workholder including jaws for peripherally engaging aworkpiece, and means on the frame of the workholder for laterallyengaging and positioning the workpiece within the jaws, said meansincluding a frame movable toward and from the workpiece, and contacts onsaid frame for lateral engagement with the workpiece at spaced pointsthereon.

19. In a machine of the character described, the combination with asupporting bed and a workholder frame rising therefrom, of an annularchuck member rotatably supported by the frame, and means on the framefor axiallv centering aworkpiece with respect to the chuck, said meansincluding arms pivoted to the frame having center points alignable withthe axis of rotation of the chuck when the arms are swung in about theirpivot, and means for retracting one of siad points to permit ofintroduction of a positioning arbor therebetween.

20. In a machine of the character described. the combination with asupporting bed and a workholder frame rising therefrom, of an annularchuck member rotatably supported by the frame, and means on the framefor axially centering a workpiece with respect to the chuck, said meansincluding a rockshaft journaled in the frame parallel with the axis ofrotation of the chuck, arms carried by said shaft and movable by rockingof the shaft into and out of the common plane of the axes of the shaftand chuck, and centering devices carried by the arms in position toalign with the chuck axis when the arms lie in such common plane.

GUSTAF A. OLIN.

